[go: up one dir, main page]

WO2009074681A2 - Dispositif de champ pour l'instrumentation d'un processus - Google Patents

Dispositif de champ pour l'instrumentation d'un processus Download PDF

Info

Publication number
WO2009074681A2
WO2009074681A2 PCT/EP2008/067451 EP2008067451W WO2009074681A2 WO 2009074681 A2 WO2009074681 A2 WO 2009074681A2 EP 2008067451 W EP2008067451 W EP 2008067451W WO 2009074681 A2 WO2009074681 A2 WO 2009074681A2
Authority
WO
WIPO (PCT)
Prior art keywords
signal
analog
output
controller
field device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2008/067451
Other languages
German (de)
English (en)
Other versions
WO2009074681A3 (fr
Inventor
Eric Chemisky
Michael Geppert
Ulrich Hahn
Simon Rohrbach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP08860820.3A priority Critical patent/EP2220460B1/fr
Priority to US12/747,489 priority patent/US8825422B2/en
Priority to CN2008801202060A priority patent/CN101896792B/zh
Publication of WO2009074681A2 publication Critical patent/WO2009074681A2/fr
Publication of WO2009074681A3 publication Critical patent/WO2009074681A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
    • G05B23/0224—Process history based detection method, e.g. whereby history implies the availability of large amounts of data
    • G05B23/0227—Qualitative history assessment, whereby the type of data acted upon, e.g. waveforms, images or patterns, is not relevant, e.g. rule based assessment; if-then decisions
    • G05B23/0235—Qualitative history assessment, whereby the type of data acted upon, e.g. waveforms, images or patterns, is not relevant, e.g. rule based assessment; if-then decisions based on a comparison with predetermined threshold or range, e.g. "classical methods", carried out during normal operation; threshold adaptation or choice; when or how to compare with the threshold
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
    • G01D3/036—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves

Definitions

  • the invention relates to a field instrument for process instrumentation, in particular a transmitter, with an analog output, to which a two-wire line for transmitting an analog output signal can be connected, according to the preamble of claim 1.
  • field instrumentation is often used for process instrumentation, which, for example, serves to detect and / or influence process variables and is connected to one another by an automation network for exchanging data.
  • Field devices that detect a physical or chemical variable as a process variable are often referred to as transmitters, as they transform the respective size into a measured value and output this example, to a higher-level control station or as an actual value to a controller for further processing. Examples of such transmitters are transmitters for level, mass flow, pressure, temperature, pH, conductivity, etc.
  • EP 1 192 614 B1 discloses a transmitter which converts a physical or chemical measured variable into an analogue output signal which corresponds to the measured value and can be transmitted on a two-wire line.
  • a suitable sensor for the physical or chemical measured variable, a downstream analog / digital converter, a downstream this arithmetic unit and a controlled by the arithmetic unit, connectable to the two-wire line output circuit is provided.
  • the sensor converts the measured variable into a sensor signal, which is digitized in the analog / digital converter and processed in the arithmetic unit to a desired value with which the analog output signal on the two-wire line is adjusted by a control device in the output circuit.
  • the digital setpoint as current setpoint is in the Output circuit initially transferred with a digital / analog converter in an analog current setpoint and implemented by a subsequent control circuit in an analog loop current.
  • the actual value of the loop current is detected using a measuring element for current / voltage conversion.
  • a measuring element for current / voltage conversion As simple measuring elements, low-resistance current measuring resistors, which are also referred to as shunts, can be used.
  • the voltage signal thus generated which is proportional to the actual value of the loop current, is supplied to a comparison device for forming a control deviation from the analog current setpoint and the actual value of the loop current.
  • a controller which is implemented as an analog controller with an integrated operational amplifier, for regulating the control deviation, a control signal for an actuator, which is formed by a transistor circuit for adjusting the loop current.
  • the measured analog actual value of the loop current is digitized with the aid of an analog / digital converter and fed to the arithmetic unit as a digital actual value.
  • the arithmetic unit is able to determine deviations between the digital actual value and the digital setpoint and to respond to it by an appropriate tracking of the setpoint. If impermissibly large deviations occur, this is communicated to the user of the field device. This can be done via a data interface and / or a display device for transmitting or displaying information about the determined deviation and thus on the measurement error.
  • the data interface is part of the output circuit and enables data communication via the two-wire cable according to the HART protocol.
  • the invention has for its object to provide a field instrument for process instrumentation with an analog output, to which a two-wire line for transmitting an analog output signal is connectable, in which a monitoring of the loop current and a detection of a malfunction of the controller or the actuator for the Loop current is possible with particularly simple means.
  • the new field device of the type mentioned in the characterizing part of claim 1 features.
  • the invention has the advantage that for the monitoring of the regulator and the actuator for the loop current, a particularly low circuit complexity is required.
  • the monitoring of the actuating signal for maintaining a predeterminable range of values can be carried out in a particularly simple manner with a comparator, which continuously checks whether the actuating signal is within a predefinable signal range.
  • the specification of the signal range is carried out taking into account the physical limits of the controller output signal and the respective circuit realization of the actuator.
  • the control signal is advantageously closely linked directly to the control deviation and characteristic of the behavior of the control of the loop current. With the help of the display signal generated in this way, error conditions can be signaled quickly and reliably.
  • the controller may be designed as a PI controller, which generates a proportional component and an integral component of the manipulated variable as a function of the control deviation.
  • the integral component causes the control signal to run into the upper or lower limit of the actuating signal in the case of a permanent control deviation, similar to a ramp function.
  • these limits approximately correspond to the supply voltages of the operational amplifier. A permanent malfunction of the Control of the loop current can be reliably detected in this way.
  • a comparator for generating the display signal can be provided and the display signal can be performed on the arithmetic unit for further treatment of an error condition.
  • a time-related evaluation of the display signal is thus made possible so that, for example, in the case of sudden changes in the setpoint value applied to the control of the loop current, subsidence of transients in the control to avoid misdiagnosis can be awaited. Since the respective profile of the setpoint of the arithmetic unit is known, the choice of the type of monitoring by the arithmetic unit can be made as a function of the setpoint course.
  • an error of the controller or of the actuator is detected by the arithmetic unit, this immediately initiates suitable measures for error handling.
  • This can be, for example, the output of an error message or a message of a maintenance requirement to a higher-level control station via the two-wire line and / or the assumption of a security state of the field device.
  • the figure shows the basic structure of a transmitter 1, which is suitable for use in an automation system for detecting a chemical or physical size.
  • the chemical or physical quantity 2 is guided on a sensor 3, which converts it into an electrical signal.
  • the analog measurement signal thus generated is digitized with an analog / digital converter 4 and fed to a computing unit 5, in which the measurement signal is corrected for linearity and temperature behavior.
  • a the Measured corresponding, calculated by the arithmetic unit 5 digital default value of a loop current is converted by means of a downstream digital / analog converter 6 in an analog set value 7 of the loop current and a control loop for setting a loop current 20 in a two-wire line 8, 9, to which the transmitter 1 is connected, supplied.
  • the loop current 20 flows through the input terminal 10, an actuator 12, a shunt 13 for measuring the loop current and the output terminal 11.
  • the actuator 12th can consist of a transistor in a simple manner, on which a control voltage as a control signal 16 is guided by a controller 14 designed as an operational amplifier.
  • the shunt 13 is realized by a precision resistor. The voltage drop across the shunt 13 19, which is proportional to the loop current 20, is fed back to a comparator 15 and there subtracted to determine a control deviation 21 of the setpoint value 7 of the loop current.
  • the controller 14 receives the control deviation 21 as an input variable and calculates therefrom a proportional and an integral component corresponding to its control parameters, which are preset, for example, by means of a suitable dimensioning of resistors and capacitors in the circuit of an operational amplifier.
  • control parameters which are preset, for example, by means of a suitable dimensioning of resistors and capacitors in the circuit of an operational amplifier.
  • the control deviation 21 disappears after the decay of possible transient effects and the control signal 16 at the output of the controller 14 remains within predetermined limits.
  • this has the immediate result in most cases that a predetermined range of values is left by the control signal 16.
  • a device 17 for monitoring the actuating signal which outputs a display signal 18 for indicating the error state to the arithmetic unit 5 when it leaves the predetermined value range.
  • the error thus recognized can by appropriate control of a display unit of the transmitter 1, which is not shown in the figure for the sake of clarity, an operator or via the two-wire line 8, 9 of a higher-level control station in an automation sticiansstrom be reported. In this way, monitoring of components in the output circuit of the transmitter 1 is made possible with comparatively little effort.
  • a transmitter has been explained as a field device.
  • the invention can also be used in other field device types with analog output, for example in actuators such as control valves or in a programmable logic controller with analog output module, which is suitable for example for connecting actuators via two-wire lines.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Programmable Controllers (AREA)
  • Testing And Monitoring For Control Systems (AREA)

Abstract

L'invention concerne un dispositif de champ pour l'instrumentation d'un processus, en particulier un convertisseur de mesure (1) comportant une sortie analogique (10, 11) à laquelle peut être relié un conducteur à deux fils (8, 9) permettant de transmettre un signal de sortie analogique (20). Le circuit de sortie contient un régulateur (14) comportant un actionneur (12) en aval pour le signal de sortie (20). Un système (17) contrôle un signal de régulation (16) afin qu'il se maintienne dans une plage de valeurs prédéfinie, de manière à contrôler le réglage correct du courant de boucle dans le circuit de sortie. Si le signal de régulation (16) sort de la plage de valeurs, un signal d'information (18) est envoyé à une unité de calcul (5) dans le but de pouvoir introduire des mesures appropriées en réaction à l'état de défaillance ainsi reconnu.
PCT/EP2008/067451 2007-12-12 2008-12-12 Dispositif de champ pour l'instrumentation d'un processus Ceased WO2009074681A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP08860820.3A EP2220460B1 (fr) 2007-12-12 2008-12-12 Dispositif de champ pour l'instrumentation d'un processus
US12/747,489 US8825422B2 (en) 2007-12-12 2008-12-12 Field device for process instrumentation
CN2008801202060A CN101896792B (zh) 2007-12-12 2008-12-12 用于生产过程用检测仪表的现场设备

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007059847A DE102007059847A1 (de) 2007-12-12 2007-12-12 Feldgerät zur Prozessinstrumentierung
DE102007059847.7 2007-12-12

Publications (2)

Publication Number Publication Date
WO2009074681A2 true WO2009074681A2 (fr) 2009-06-18
WO2009074681A3 WO2009074681A3 (fr) 2009-11-26

Family

ID=40679863

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/067451 Ceased WO2009074681A2 (fr) 2007-12-12 2008-12-12 Dispositif de champ pour l'instrumentation d'un processus

Country Status (5)

Country Link
US (1) US8825422B2 (fr)
EP (1) EP2220460B1 (fr)
CN (1) CN101896792B (fr)
DE (1) DE102007059847A1 (fr)
WO (1) WO2009074681A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102472634A (zh) * 2009-07-23 2012-05-23 西门子公司 用于过程仪表的现场设备
US20120278042A1 (en) * 2009-10-26 2012-11-01 Siemens Aktiengesellschaft Field Device for Process Instrumentation

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008020862B3 (de) * 2008-04-25 2009-05-14 Siemens Aktiengesellschaft Messumformer zur Prozessinstrumentierung und Verfahren zur Überwachung des Zustands dessen Sensors
DE102011082018A1 (de) 2011-09-01 2013-03-07 Siemens Aktiengesellschaft Verfahren zum Betreiben eines Feldgeräts für die Prozessinstrumentierung sowie Feldgerät
DE102011087157B4 (de) * 2011-11-25 2015-10-15 Siemens Aktiengesellschaft Prozessautomatisierungsgerät
CA2873034C (fr) * 2012-05-29 2019-03-12 Rosemount Inc. Verification du courant d'une boucle de commande de processus
CN104142161A (zh) * 2014-07-31 2014-11-12 天津二十冶建设有限公司 一种用于施工现场热工仪表快速调试方法
US10809687B2 (en) * 2014-09-30 2020-10-20 Emerson Process Management Lllp. Field device with self-recovery
US10082784B2 (en) * 2015-03-30 2018-09-25 Rosemount Inc. Saturation-controlled loop current regulator
DE102015105090A1 (de) * 2015-04-01 2016-10-06 Krohne Messtechnik Gmbh Verfahren zum Betreiben eines Feldgerätes und entsprechendes Feldgerät

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1342722A (en) * 1970-01-16 1974-01-03 Honeywell Ltd Control circuits for use in control systems
US4783659A (en) * 1986-08-22 1988-11-08 Rosemount Inc. Analog transducer circuit with digital control
DE4015042A1 (de) * 1990-05-10 1991-11-14 Siemens Ag Vorrichtung zur analog-digital-wandlung einer messgroesse, die von in brueckenschaltung angeordneten sensoren erzeugt wird, insbesondere von dehnungsmessstreifen in einer waegezelle
FI111106B (fi) * 1999-02-19 2003-05-30 Neles Controls Oy Menetelmä prosessinsäätösilmukan virittämiseksi teollisuusprosessissa
US6445962B1 (en) * 1999-03-15 2002-09-03 Fisher Rosemount Systems, Inc. Auto-tuning in a distributed process control environment
DE19930661A1 (de) * 1999-07-02 2001-01-18 Siemens Ag Meßumformer
DE10146949A1 (de) * 2000-11-22 2002-06-06 Continental Teves Ag & Co Ohg Aktiver Magnetsensor für elektronische Bremssysteme
DE10202028A1 (de) * 2002-01-18 2003-07-24 Endress & Hauser Gmbh & Co Kg Transmitter
US6725182B2 (en) * 2002-07-31 2004-04-20 Smar Research Corporation System and method for monitoring devices and components
US7113890B2 (en) * 2003-10-16 2006-09-26 Abb Inc. Method and apparatus for detecting faults in steam generator system components and other continuous processes

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102472634A (zh) * 2009-07-23 2012-05-23 西门子公司 用于过程仪表的现场设备
CN102472634B (zh) * 2009-07-23 2014-07-30 西门子公司 用于过程仪表的现场设备
US20120278042A1 (en) * 2009-10-26 2012-11-01 Siemens Aktiengesellschaft Field Device for Process Instrumentation
US9194718B2 (en) * 2009-10-26 2015-11-24 Siemens Aktiengesellschaft Field device for process instrumentation

Also Published As

Publication number Publication date
EP2220460A2 (fr) 2010-08-25
US20100305896A1 (en) 2010-12-02
DE102007059847A1 (de) 2009-06-18
WO2009074681A3 (fr) 2009-11-26
US8825422B2 (en) 2014-09-02
CN101896792B (zh) 2012-06-20
CN101896792A (zh) 2010-11-24
EP2220460B1 (fr) 2015-07-29

Similar Documents

Publication Publication Date Title
EP2220460B1 (fr) Dispositif de champ pour l'instrumentation d'un processus
EP2274656B1 (fr) Appareil de mesure comportant une électronique de mesure et d'exploitation pour le contrôle d'un signal de mesure
EP1860513A2 (fr) Circuit destiné à la transmission sécurisée d'une valeur de signal analogique
EP2494313B1 (fr) Appareil de terrain pour l'instrumentation de processus
EP2246984A9 (fr) Commutation de diagnostic destinée au contrôle d'une commutation de conversion analogique-numérique
DE102017126754B4 (de) Eingangsschaltung zum fehlersicheren Einlesen eines analogen Eingangssignals
EP3538962A1 (fr) Procédé d'analyse de dysfonctionnements dans une installation de l'automatisation de processus
DE102007036580A1 (de) Feldbuseinheit für einen Zwei-Leiter-Feldbus
EP1966876A1 (fr) Circuiterie d'alimentation d'un appareil de terrain de la technologie de l'automatisation
DE102004021750A1 (de) Verfahren zur Signalisierung von Alarmzuständen an einem Feldgerät der Automatisierungstechnik
EP2622417A2 (fr) Procédé de récupération destiné à un appareil comportant une sortie de courant analogique pour l'émission d'une valeur de mesure ou d'une valeur de réglage
EP2798315B1 (fr) Circuit pour réduire la puissance dissipée sur une sortie de courant active d'un appareil de terrain
EP4139753A1 (fr) Dispositif de terrain d'automatisation
EP2981793B1 (fr) Convertisseur de mesure pour instrumenter un procédé et methode de surveillance de l'état de ses capteurs
DE102004039698B4 (de) Peripherieeinheit für ein Automatisierungsgerät und redundantes Steuersystem mit solchen Peripherieeinheiten
EP3709108B1 (fr) Configuration d'une entrée bipolaire
EP2603772B1 (fr) Circuiterie de régulation et de surveillance d'un courant de signal et transducteur de mesure comprenant une telle circuiterie
DE102016124162A1 (de) Verfahren zur applikationsspezifischen Einstellung eines Feldgeräts
DE102005051795A1 (de) Anzeigeeinheit für die Prozessautomatisierungstechnik
DE102008020508A1 (de) Vorrichtung zur Erfassung oder Beeinflussung einer physikalischen und/oder chemischen Prozessgröße
EP3460419A1 (fr) Agencement de mesure et appareil de mesure doté d'un agencement de mesure
DE102021121048A1 (de) Zweileiterfeldgerät sowie Messanordnung mit einem Zweileiterfeldgerät
EP3153938B1 (fr) Dispositif de mesure

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200880120206.0

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 2008860820

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08860820

Country of ref document: EP

Kind code of ref document: A2

WWE Wipo information: entry into national phase

Ref document number: 12747489

Country of ref document: US